The fully developed caterpillar of Eilema pygmaeola pygmaeola measures 15-18 mm. It lives in sandy dune areas on the North Sea coast and feeds on lichens, mosses and old plant parts.
The caterpillar of this moth lives rather hidden on lichens. It is fully grown in June and spends the winter before pupating in a web. Little is known about the mode of life of this moth species. It is currently explored within the framework of a project on the East Frisian Islands in order to initiate, if necessary, protective measures for this rare subspecies.